Abstract
Forced convection saturated R-134a boiling experiments were conducted in a vertical mini-quartz tube coated with a transparent heater; the inner diameter of the tube was 1.33 mm and the heated length 235.5 mm. The dynamics of the saturated boiling process, bubble characteristics, and behavior were studied using a high-speed CCD camera at different mass fluxes in up-flow at 6.425 bar. The heat fluxes were 5 and 20 kW/m2. The flow visualization results show that the bubble departure frequency generally increases as the heat flux increases. In addition, bubble lift-off diameter, growth rate, and velocity after bubble lift-off were determined by analyzing the images.
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